That is the logic for settling play ground disputes not legal principles.
If I steal your watch and flee into my home, you do not gain the right, as the watch owner, to break into my residence and assault me.
An extreme example but O.J. Simpson went to jail for breaking into a Las Vegas hotel room to reclaim sports memorabilia he claimed had been stolen from him.
Also, "self-defense" claims end when the person being assaulted chases after the original assaulter and breaks into their residence to continue the confrontation. At that point, the chaser becomes the aggressor. [Tennessee is a "stand your ground" state so Ruby really put herself in jeopardy by breaking down the door and forcibly entering the premise because that "threatening" action gave the other party a legal justification for using deadly force.]
This situation could have gotten really, really tragic.
Again, I am not assuming that Ruby will be guilty as charged, when all the facts are revealed. I am just responding to what was stated in the police report.